Visited one of our LFS today. They have been setting up a 300 or so tank for awhile now. Today there was water in it and appears they are cycling the tank. While lookng at the tank I noticed that the return lines actually rotated approximately 90 degrees. I could not get a clear look at the mechanism. Anybody have info on this type of setup? Seems like it would help reduce dead spots however, anything that moves can ultimately break.